Anker&reg; 2 x 1800mAh Li-ion Batteries for Samsung Infuse 4G, I997 + Free Anker Multi-purpose USB Travel Charger Battery type: Li-ion; Voltage: 3.7V; Capacity: 1800mAh Uses selected Top 10% Grade A cells to ensure longer battery life and charge cycles; More than 500 recharge cycles over the life of the battery. Built-in circuit protection; Certified by CE / FCC / RoHS Multi-functional charger allows for the charging of two batteries simultaneously; Indicator shows the current charging state (red for charging; blue for fully charged) Charger output: 4.2V 600mA, USB output: 5V 600mA. The charger can charge more than 90% cell phones Compatible with various devices: Samsung Infuse 4G, I997...(full list below) 24 x 7 email support, 8-hr x 5-weekday call support, 18-month hassle-free warranty, Shipping same or next business day